package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;

@Service
@Slf4j
public class UserServiceImpl implements UserService {


    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 微信用户登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenid(userLoginDTO.getCode()); //调用微信接口服务，获得当前微信用户的openid

        log.info("您的openid为:{}",openid);
        if (openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED); //抛出登录失败异常
        }

        //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        //判断当前用户是否为新用户，如果是新用户则自动完成注册
        User user = userMapper.getByOpenId(openid);

        //根据openid查询用户是否存在，如果存在则更新用户信息，如果不存在则新增用户
        if (user == null) {
           user = User.builder()
                    .openid(openid) //openid
                    .createTime(LocalDateTime.now()) //创建时间
                    .build();
           userMapper.insert(user); //新增用户
        }

        //返回这个用户对象
        return user;
    }

    /**
     * 调用微信接口服务，获得当前微信用户的openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
        //调用微信接口服务，获得当前微信用户的openid
        HashMap<String, String> map = new HashMap<>(); //声明参数
        map.put("appid",weChatProperties.getAppid()); //小程序appid
        map.put("secret",weChatProperties.getSecret()); //小程序appsecret
        map.put("js_code",code); //登录时获取的code
        map.put("grant_type","authorization_code"); //授权类型

        String json = HttpClientUtil.doGet(WX_LOGIN, map); //调用微信接口服务，获得当前微信用户的openid

        JSONObject jsonObject = JSON.parseObject(json); //将json字符串转换为json对象
        String openid = jsonObject.getString("openid");//获得openid
        return openid;
    }
}
